Charms are spells that change part of the object, not the object itself. Transfiguration is when you completely change the object itself. Charms can be used in practical things like making food! You can help cook it, help prepare it, and help make it appear more beautiful. When baking, you can make the dough into different shapes. You can also make it change colors. Or sparkle. Or sing. Or lots of other things to make it more amazing. This isn't always practical, but using charms to cook and prepare food is. You can also use charms to make things levitate and clean and read people's minds.